Fastener



FIG. 1 is a perspective view of a fastener showing my new design;

FIG. 2 is a front view thereof, a rear view being identical to the front view;

FIG. 3 is a right side view thereof, a left side view being identical to the right side view;

FIG. 4 is a plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a cross-sectional view thereof along the line 6-6 in FIG. 2;

FIG. 7 is a cross-sectional view thereof along the line 7-7 in FIG. 2; and,

FIG. 8 is a cross-sectional view thereof along the line 8-8 in FIG. 3.

The broken lines depict portions of the fastener that form no part of claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 